If you are looking for specific car model support, it is best to check forums that provide updated lists of covered vehicles. : You take that code, manually edit your data dump file, and flash it back onto the chip. The Elephant in the Room: Legality : You open the file or input the hex values into the software. Tachosoft Online Mileage Calculator User Guide - Manuals.plus Users enter a desired mileage value, and the software generates the corresponding hex data required to update the vehicle's electronic memory. Vehicle Support: